A manufacturing method of Best BN coating factory quartz fiber belongs to the technical field of quartz fiber production. The present invention is to coat the surface of the quartz fiber after diluting the water-soluble boron nitride with deionized water during the drawing process of the quartz fiber Treatment. The Best BN coating factory quartz fiber produced by the method of the present invention can effectively reduce the brittleness of the quartz fiber reinforced silicon nitride composite material. It solves the problem that the existing quartz fiber fabric is used as the reinforcing phase to prepare the quartz fiber reinforced silicon nitride composite In the case of materials, because the untreated quartz fiber and the silicon nitride matrix form a strong interface bond, the cracks generated by the shrinkage of the matrix during the cracking process are easy to penetrate the fiber, leading to the problem of brittle fracture of the material. It is suitable for preparing quartz fiber reinforced silicon nitride composites. Material when used.

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